Different generational tastes and different appeal. The "bling-bling" era was a blessing and curse to hip-hop IMHO. That era showed hip-hop's true universal talent and appeal beyond NYC and LA; however, it also turned the genre into a meme of itself. The "social media" era, was the death nail.

I grew up listening to Nas, Big Daddy Kane, Rakim, and the like. I grew up during the Golden-era of hip-hop and am thankful these emcees are still touring (been lucky enough to see Rakim, Kane, and Krs One in concert). These gentlemen are in middle to almost senior age, and they are still oozing with raw talent and charisma. I don't think social media and mumble rappers of today will ever experience that same type of longevity because the talent simply isn't there.